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International Society for Industrial Process Tomography

3rd World Congress on Industrial Process Tomography

Near Infra-red Tomography for Concentration Measurements of Exhausting Water Vapour of a Packed Bed Adsorber


Karijm Salem1, Dieter Mewes1, Evangelos Tsotsas2


1 Institute of Process Engineering, University of Hannover, Callinstrasse 36, D-30167 Hannover, Germany, dms@ifv.uni-hannover.de

2 Thermal Process Engineering, University of Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany, evangelos.tsotsas@vst.uni-magdeburg.de


ABSTRACT


The tomographic measurement technique in the near infra-red enables the measurement of local water vapour concentrations at the exit of a packed bed adsorber. This is done by extending the adsorption column with a hollow glass cylinder that serves as the measurement cross-section. The glass is transilluminated from three directions with three light-sheets. The light absorption by the water vapour is measured with three InGaAs photodiode arrays and these projections are used for the tomographic reconstruction of the concentration fields. For low water vapour concentrations (c<9E-4 mol/l ) an error below 15% is reported. Concentration field measurements during adsorption show the early breakthrough near the column wall due to channeling effects at a low ratio between tube and particle diameter.


Keywords Adsorption, Optical Tomography, Wavelength-Modulation, Reconstruction

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